Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated

Planting zone for 23337 — Wallops Island, VA

ZIP code 23337 (Wallops Island, Accomack County) is in USDA zone 8a: the coldest winter night averages 10 to 15 °F. The median last spring frost is March 31 and the first fall frost November 11.

Where ZIP 23337 is

Outlined: the ZIP code area · tap the map for the zone at any spot · scroll or pinch to zoom

Not the official USDA Plant Hardiness Zone Map. Zones come from the 2023 USDA hardiness-zone data by the PRISM Group, Oregon State University; we re-mapped and recolored them. The official map is at planthardiness.ars.usda.gov.

Zone8a10 to 15 °F
Coldest night−12.2 to −9.4 °C
Last frostMar 31
First frostNov 11
2012 zone7b

Was 7b on the 2012 map — half a zone warmer now. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 8a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Wallops Island, VA…

Forecast data: National Weather Service (api.weather.gov), public domain. This is not a warning service — for official frost and freeze warnings see weather.gov.

Frost dates in Wallops Island, VA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMarch 31median — 50% chance of a later frost
Safe for tender plantsApril 13only 10% chance of frost after
First fall frostNovember 11median — 10% chance by Oct 31
Growing season225 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 20 and returns around November 24.

From the NOAA station Wallops Island Flight Fac, VA — within 1 mile, elevation 39 ft. NOAA NCEI U.S. Climate Normals 1991–2020, 32 °F threshold. Low spots and valleys can freeze later in spring than the station.

When to plant vegetables in 23337

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 17 – Mar 3
SpinachSow outdoors · Feb 17 – Mar 10
Broccoli, cabbageStart indoors · Jan 20 – Feb 3
Broccoli, cabbageTransplant · Mar 10 – Mar 24
Onion setsPlant outdoors · Mar 3 – Mar 17
PotatoesPlant outdoors · Mar 10 – Mar 24
LettuceSow outdoors · Mar 3 – Mar 17
Carrots, beetsSow outdoors · Mar 10 – Mar 24
TomatoesStart indoors · Feb 3 – Feb 17
TomatoesTransplant · Apr 7 – Apr 21
Peppers, eggplantStart indoors · Jan 20 – Feb 3
Peppers, eggplantTransplant · Apr 14 – Apr 28
BeansSow outdoors · Apr 7 – Apr 21
Sweet cornSow outdoors · Apr 7 – Apr 21
Cucumbers, squashSow outdoors · Apr 7 – Apr 21
Fall lettuce, spinachSow outdoors · Sep 16 – Sep 30
GarlicPlant cloves · Oct 28 – Dec 2
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 31) and first fall frost (Nov 11) with the rules of thumb U.S. extension services publish. Cool-season crops take a light frost; warm-season crops do best once the soil is above about 60 °F.

When spring arrived in 2026

In 2026, spring leaf-out near 23337 came on Mar 10 — 7 days later than the 1991–2020 average (Mar 3).

JanFebMarAprMayJun

The Spring Index marks the day when accumulated warmth is enough for lilac and honeysuckle to leaf out — a widely used signal that the growing season has started. Source: USA National Phenology Network, www.usanpn.org — Spring Indices, first leaf, 2026 (data as of 2026-09-08) and 30-year average 1991–2020 (CC BY 4.0).

Soil in Wallops Island, VA

The soil mapped at the center of ZIP 23337 is Bojac — fine sandy loam, well drained.

TextureFine sandy loamdrains and warms fast; dries out and needs more feeding
pH5.1strongly acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter0.75%low — add compost
Hydrologic groupAwater soaks in fast
Farmland classprime farmlandUSDA classification

Map unit: Bojac fine sandy loam, 0 to 2 percent slopes.

Soil Survey Staff, Natural Resources Conservation Service, USDA. Soil Survey Geographic (SSURGO) Database, via Soil Data Access, accessed 2026-10-29. The soil at the center point of ZIP 23337; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Wallops Island, VA

Summer high86 °Faverage high, July
Winter low30 °Faverage low, January
Hot days19days a year at 90 °F or more
Freezing nights69nights a year at 32 °F or less
Growing degree days4,181base 50 °F — the season’s usable heat
Longest day14 h 48 mindaylight on June 21
Shortest day9 h 32 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation43.3 inper year, rain and melted snow
Snowfall8 inper year; 6 days with snow on the ground

Average high and low, by month

20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 46 °F, low 30 °F 46°30° JanFebruary: average high 49 °F, low 31 °F 49°31° FebMarch: average high 55 °F, low 37 °F 55°37° MarApril: average high 64 °F, low 46 °F 64°46° AprMay: average high 73 °F, low 56 °F 73°56° MayJune: average high 81 °F, low 65 °F 81°65° JunJuly: average high 86 °F, low 70 °F 86°70° JulAugust: average high 84 °F, low 69 °F 84°69° AugSeptember: average high 79 °F, low 63 °F 79°63° SepOctober: average high 69 °F, low 51 °F 69°51° OctNovember: average high 59 °F, low 41 °F 59°41° NovDecember: average high 51 °F, low 34 °F 51°34° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″January: 3.15 in precipitation, 3.5 in snowfall 3.1❄4 JanFebruary: 2.81 in precipitation, 2.3 in snowfall 2.8❄2 FebMarch: 3.91 in precipitation, 0.7 in snowfall 3.9❄1 MarApril: 3.12 in precipitation, 0.2 in snowfall 3.1 AprMay: 3.20 in precipitation 3.2 MayJune: 3.39 in precipitation 3.4 JunJuly: 4.37 in precipitation 4.4 JulAugust: 4.32 in precipitation 4.3 AugSeptember: 4.33 in precipitation 4.3 SepOctober: 4.02 in precipitation 4.0 OctNovember: 2.88 in precipitation 2.9 NovDecember: 3.75 in precipitation, 1.7 in snowfall 3.8❄2 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Wallops Island Flight Fac, VA (within 1 mile); precipitation: Wallops Island Flight Fac, VA (within 1 mile). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 8a.

234838a
Wattsville, VA · 2 mi
233958a
Horntown, VA · 2 mi
233038a
Atlantic, VA · 3 mi
234158a
New Church, VA · 5 mi
233968a
Oak Hall, VA · 5 mi
234168a
Oak Hall, VA · 5 mi
234428a
Temperanceville, VA · 6 mi
233568a
Greenbackville, VA · 7 mi

Virginia planting zones →

Questions about 23337

What planting zone is ZIP code 23337?

ZIP code 23337 (Wallops Island, VA) is in USDA hardiness zone 8a on the 2023 map: the coldest night of an average winter reaches 10 to 15 °F (−12.2 to −9.4 °C).

When is the last frost in Wallops Island, VA?

The median last spring frost (32 °F) near 23337 is March 31; after April 13 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Wallops Island Flight Fac station.

When is the first frost in Wallops Island, VA?

The median first fall frost near 23337 is November 11, giving a median frost-free growing season of 225 days.

When should I plant tomatoes in 23337?

Start tomato seeds indoors around Feb 3 – Feb 17 and set transplants outside around Apr 7 – Apr 21, one to three weeks after the median last frost.

How much rain and snow does 23337 get?

About 43.3 inches of precipitation a year and 8 inches of snowfall (NOAA 1991–2020 normals, Wallops Island Flight Fac station).

How hot do summers get in Wallops Island, VA?

The average high peaks at 86 °F in July, with about 19 days a year at 90 °F or more.

What kind of soil does 23337 have?

The USDA soil survey maps Bojac at the center of ZIP 23337: fine sandy loam, well drained, pH about 5.1 (strongly acidic).

Did spring come early in Wallops Island, VA in 2026?

Spring leaf-out near 23337 came on Mar 10 in 2026, 7 days later than the 1991–2020 average (Mar 3), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Wallops Island, VA?

Intermediate onions: the longest day near 23337 is 14 h 48 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 23337 change?

Yes. The 2012 USDA map put 23337 in zone 7b; the 2023 map puts it in zone 8a. The newer map uses 1991–2020 data and more weather stations.